Safety interval lock mechanism



April 13, 1937.

P. S. MILLICE SAFETY INTERVAL LOCK MECHANISM Filed March 26, 1956 4 Sheets-Sheet 1 //V E/VTOR' April 3, 1937. P. s. MILLICVIE 2,077,365

SAFETY INTERVAL LOCK MECHANISM Filed March 26, 1936 4 sheets-Sheet 2 25. E215. 72/ a M w 36 7 f a/ 1% 6? ma ma //0 24 W I. x /06 $2 /W //7 I /27 /06 I xiv,

April 3, 1937. P. s. MILLICE 2,077,365

SAFETY INTERVAL LOCK MECHANISM Filed March 26, 1936 4 Sheets-Sheet 4 Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE SAFETY INTERVAL LOCK 'ME CHANISM Applicationv March 26, 1936, SerialNo. 70,987

19 Claims;

My invention relates-to lock mechanism, and has for its-primary obiect theprovision of novel means for insuring. a safety interval for lockrelease.

It is a further object of my invention. to provide a delay in novel manner between the beginning. of unlocking movement of alock and completion of the unlocking. movement, in order to provide a time interval in the unlocking of the lockas a safety feature in case of a hold-up or anattempt at robbery.

My improved device isv intended for associationwith combination locks,key locks and. other types of l'ocks,.including bolts, and-is for useprimarily in connection-with safes and wallvaults,.but may be used in. connection with closets, chests and drawers, and in other relations.

My improved device is not. intended. to takethe place of long. interval timelocks-which are used for protection. of heavy safes and bank vaultsover night, Sundays, holidays and the like, but may be. used in connection therewith. It is in-* tended. primarily toprovide a simpleandinexpem sive means to prevent the immediate opening of a locked compartment upon the demand of a hold-up manor robber.

My inventionconsists. in novel means for preventing the immediate unlocking. ofa lock; fur-- ther, in novel means for arresting the unlocking oi a lock and insuring lapse at an interval of time beforecompletion-of such unlocking; further, in novelmeans for insuring: resetting of the safety mechanism priorv toa relockingof' alock; further, in novel means for compelling the unlocking movement of a lock totake. place insteps, including. a time interval; further, in novel means for automatically controlling the actuation of clock mechanism and its duration for determining a safety time interval throughout which delay in opening a lock is-insured; and, further, in providing means for a minimum. limit of timeinterval.

My invention will be further readily understood from the. following descriptionand claims, and from the: dravw'ngs, inwhich. latter:

Fig. L is afront elevation of an exempl'ification of my invention. shown in connectionwith acombinationlock on'a-vault door, partly'broken'away.

Fig. 2' is ahorizontalsection-ofthe same, taken on the-line 2--2.of Fig. 1, and partly brokenaway.

Fig. 3 is a vertical section of the same, taken on the iregular line: 3-3 of Fig. 5, and partly broken. away.

Fig. 4- is ahorizontal sectionof a detail of the same, taken on the line 44 of Fig. 5.

Fig. 5" is a vertical section, taken in the plane of the line 5'5 of Fig. 9, showing the parts in fully locked relation.

Fig. 6 is a similar view, showing the parts'i'r'i their relation at the beginning of the safety interval in the unlocking movement, and indicating the distance of movement of the lock bolt, the fully locked position of the same being shown in dotted lines.

Fig. '7 is a similar view of my improved d'evi'ce, showing the parts in their relations at the end of the safety interval.

Fig. 8 is a similar view of my improved device, showing. the parts inunlocked relation, positions of the lock bolt at previous stages being shown in dotted lines.

Fig. 9 is a horizontal. section of my improved device, taken on the line 99 of Fig. 1, and partly broken away.

Fig. 10 isa vertical section of a detaiLtaken on the line I 0-4 0 of Fig. 9.

Fig. 11 is a front elevation of my improved device, employed in connection with a key lock, and partly broken away.

Fig. 12 is a horizontal section of the same, taken onthe-line I2-l2 of'Fig. 11'.

Fig. 1'3 is a vertical section of a detail of thesame, taken on the irregular line l3--|'3' of Fig. 14.

Fig. 14 is a-vertical section of the same, taken on the line |4l4' of Fig. 12, partly broken. away, and showing a modification of my improved device, and,

Fig. 15 is a-fragmentary sectionalview, takenin the plane of the line 5 -5 of Fig. 9, showing. a further modification of my improved device.

I have illustrated my invention as employed in connection with a so-called combinationor permutation lockin'Figs. 1 to 10-inclusive, and-have illustrated it as employed inconnectionwith a key lock-in Figs. 11 to l i-inclusivee Fig. 14 shows a modification of my improved device. Fig. 15 shows a further modification.

Referring to -Figs. lto 10 inclusive, the door ofa safe-vault is exemplified at: 21, and has mounted. thereon a usual combination lock 22-, on amounting plate. 23,. rigidly secured tothe door. The: combination lock is provided with a locking. part, exemplified as a. lockbolt 24 arranged to coact with a locking arm 25- of a-usualbolt work26.

The locking arm isoperated-by a usual stair- 21- journaled in the door, andhavinga suitable operating handle 28-at its outer end.

The combination'lock is provided with-a casing 3| and is suitably secured to the door. The lock screws and shoulders 45 on said collars.

is provided with the lock bolt 24-, which is locked and unlocked by suitable usual tumbler mechanism 32 manipulated by a suitable knob 33, the knob also shifting the lock bolt into locking and unlocking relation.

A clock mechanism or time mechanism is represented at 35 and a control mechanism in association with the lock and the clock mechanism is represented. at 36, there being simple connections between the control mechanism and the lock and the clock mechanism for connecting them in operative relation with each other.

The control mechanism is provided with a supporting plate M. This plate is resiliently mounted on the lock casing, as by being provided with tongues ii. which extend from the body of the supporting plate and form a resilient mounting for the control mechanism, the metal or material of the plate and the form of the tongues providing sufficient resilience for the mounting. Screws 43 pass through spacing collars "t4 separating the tongues from the lock casing 36, and are threaded into said casing, the tongues being clamped between the heads of said These spacing collars may if desired be of resilient material.

The tongues 42 and the spacing collars '14 are, however, preferably sufficiently stiff to prevent excessive vibration and contact between the parts of my improved device and the lock to prevent percussion between the same.

The clock mechanism is mounted on the resiliently supported supporting plate 6!, as by screws d6 passing through the supporting plate and collars i'l between the supporting plate and the frame rear plate 58 of the clock mechanism and threaded into the plate 48, clamping the clock frame to the supporting plate, whereby the clock mechanism is also resiliently mounted with relation to the control mechanism and to the door to prevent shocks thereto in case of blows upon the door or parts of the look.

A casing 5! is received about the control 1nechanism and the clock mechanism and is preferably free of contact therewith. It is secured to the lock casing ti by screws 52 passing through lugs 53 on the casing 5! and threaded into the casing 3!. (Fig. 9.)

The clock mechanism 35 may be of any desired construction. It is shown provided with a usual escapement mechanism 53 including a usual bal ance wheel 59. The escapement mechanism is normally inactive, the clock mechanism running only from the time that opening of the lock is begun to the time of automatic release of the bolt of the look.

A usual clock spring 6! is provided, which is wound by a shaft 62, about which there is a spring 63. The spring 5! unwinds this shaft when the clock mechanism is running. The outer end of the spring 6! is received about a tie rod 6 3 between the front plate '55 and the rear plate 68 of the clock mechanism.

The shaft 62 is provided with a flange 86. It has a sleeve 67 rotatable thereon, which has a ratchet wheel 68 fixed on one of its ends. A pin 69 is fixed crosswise of the shaft in the shaft and serves as an end abutment for the sleeve.

A gear 1! and a disk '52 receiving end contact of the spring 6! are mounted loose on the sleeve. Pawls 13 are pivoted to the gear, and are resiliently held-in engagement with the teeth of the ratchet wheel 68 by springs M fixed to said gear. One end of the spring 6! is hooked in usual manthe clock mechanism and for actuating the devices actuated by said shaft, but permitting rotation of the shaft within the spring for setting purposes.

Suitable clock gearing l5 connects with the gear I! and is controlled by the escapement mechanism 58. The sleeve 5'! is provided with a pin 16, which coacts with the pin 59, extending at right angles to said shaft for conveying rotary motion between the shaft and the sleeve for winding the spring 6! when the shaft is rotated in one direction. The frictional engagement between the shaft 62 and the sleeve \i'! permits rotation of the shaft in either direction for setting a pin 1! on said shaft in proper angular relation.

An operating part is clock controlled and is shown as a lever 8! is pivoted on a shoulder screw 82 threaded in the supporting plate 4!, and is normally urged in upward direction by a, spring 83 contacting a pin 84 fixed in the supporting plate, the upward movement of this lever being imited by a pin 85 fixed in said plate. The lever has a latching extension 66 or keeper, having a keeper face 8?.

The lever is rovided with an actuator lug 88 arranged to be contacted by the actuating pin Ti fixed to and extending from the shaft 62 and r0 tating with said shaft for retracting movement of said lever during winding rotation of said shaft, the lever being actuated by said pin during the reverse rotation of said shaft in unwinding direction.

A double bar comprises a bar 3! which is longitudinally and pivotally movable, and a bar 92 which is pivotally movable, forming a combined lever and slide. The bar 9! is a control slide for the clock mechanism, and the bar 92 is a detent for the bolt actuated slide hereinafter described. These bars are pivoted on a shoulder screw 93 threaded to the supporting plate 4!. The bar 9! is provided with slots 94, 95, and the bar 92 is provided with a pin 85? received in the slot 95. The screw 93 extends through the slot 94. (Figs. 4 and 5.)

The screw 93 and the pin 95 maintain the bars in parallelism with each other, the walls of the slots 94, 95 riding on the screw and pin respectively during longitudinal movement of the bar 9!. The right-hand ends of the combined bars are normally urged downwardly by a spring 9'! coacting with a pin 98 fixed in the supporting plate. The bar Si is provided with a bevel corner 5S, and the bar 92 is provided with a latching corner I89, the bevel of the corner 99 sloping toward and protecting the corner IEO when the corner E59 coacts with its keeper.

A movable part exemplified as a longitudinally movable slide 35 is held toward the supporting plate t! by shoulder screws M6 threaded into the supporting plate and passing through slots ID? in the slide H35. This slide is provided with an opening I38 into which a pin m9 is received, the pin extending from an inside portion of the bolt 24, which extends into the lock casing 3!, the pin extending through a slot H0 in the supporting plate. The pin moves with the bolt. This slide may be designated a lock control part.

The slide m5 is provided with a keeper face H4. A detent lever H5 is pivoted to this slide on a shoulder screw I. I6 threaded into the slide, and a spring II'I, contacting the head of one of the screws. I06 and movable thereon, normally urges the detent II5. toward the extension. 86..

. Such movement of the detent H5 is limited by its contact with the head of shoulder screw 93. The detent is provided with a detent face II 8 which coacts with the keeper face 81.

The lever 8I is providedv with an engaging lug I I 9- which engages one or both of the bars IN, 92 for rocking the same on their pivot 93 and maintaining the same in rocked. relation from the time that the lever 81 is moved on its pivot by the actuating pin 11 until the return of the parts I' to normal positions, namely, throughout the i a screw I25. threaded in the supporting plate, for

rigidly securing this end to the supporting plate. The spring has a depending portion I26, a bent portion I21 and an upwardly extending portion I28, from which latter the lateral extension I22 projects.

.The bar Si is. arranged to flex the. spring for moving the lateral extension I22 thereof in an are which is eccentric to and flatter than the circle of the outer periphery of the balance wheel.

' During the first part of the movement of the lateral extension, when the spring is moved by the bar 9|, the frictional engagement between such lateral extension and the outer periphery of the balance wheel moves the balance wheel about its axis for starting actuation of the clock mechanism, and freeing the balance wheel during the latter portion of its movement, so that the balance wheel will continue its oscillations after it is free from said spring.

The balance wheel continues to oscillate under the influence of the clock spring 6I throughout the duration of time set for the safety interval, at the end of which time the bar BI and the spring I2I are automatically returned to normal positions, with the lateral extension I22 contacting the balance wheel for automatically stopping the latter and causing cessation of operation of the clock mechanism.

A winding wheel I3I- is attached to the shaft 62 for rotating the shaft and being rotated thereby. This. wheel has a series of time indications I32 around its flange I33. These time indicationsv are exemplified. as zero to- 30, representing minutes in time intervals of five minutes. Durations of angular movements of the shaft 62 are represented by these time values which may be of desirablev durations.

There is an indicating mark I34 on. the casing. 51 with which the time indications on the wheel are arranged to register. The normal-position of the wheel is a registry of the zero indicating mark thereon with the indicating mark on the casing. The winding wheel is preferably spaced from the casing BI and the shaft 62 passes through an enlarged hole I35 in said casing for desired safety vibrations of the control mechanism and clock mechanism.

The frictional connection between the shaft 62 and the clock spring BI permits manual rotation of the. wheel I3sI and the pin. 11' thereon without affecting the clock mechanism, and the pin 69. thereon which coacts with the pin- IE on the sleeve. 01- insures sufficient winding of the clock spring, so that the settings of the indicator or winding wheel also. insures sufiicient winding of the clock to avoid running down of the clock during locked: relation of the closure.

If the wheel IJ3I be turned by hand to the extent of an angular movement, so as. to register the numeral I0. thereon with the indicating mark I34, an interval of ten minutes. will elapse between the. time when the unlocking of the lock is begun and the time when the unlocking can be completed.

This would make it necessary for the hold-up, man or robber to wait ten minutes after he has compelled an attendant tobegin opening thesafe or compartment, before the safe or compartment.

can be actually opened to enable the attendant or hold-up man to gain entrance to-v the. safe orcompartment for its contents.

The theory is that this interval of time, which may be arbitrarily selected upon previous locking of the door, and in the present exemplification. may be anywhere up to thirty minutes, outside help may be obtained or some circumstance will arise to. prevent the hold-up or robbery, or will result in the departurev of the hold-up man or robber without committing his crime.

The normal position of the parts is shown. in. Fig. 5, with the pin 'I'l in. the position it will. as,- sume with the dial or winding wheel I31 set at a duration of ten minutes.

It may be here stated that the door is supposed to be closed and locked except at such short intervals during which it may be necessary to. ob-

tain access to the safe or compartment, so that the parts of the mechanism are normally in. locked relation with the door closed.

In this connection the positions of the pin. H. the lever 8:I, the bars BI, 92, the slide I05 and the detent II5 thereon, and the positions. of the keeper face N4, the pin I09 and the bolt 24: are to be noted.

It will be assumed that it is desired. to open the door either by the attendant to obtain lawful access to the interior of the compartment or upon the demand of a hold-up man or robber. The setting of the combination of the lock and the attempt to move the bolt 24 of the lock in unlocking direction by manipulation of the knob 33, permits movement of the lock bolt in unlocking direction only to a small extent, as indicated by the space between the dotted end of the bolt, which represents the original position of the bolt, and the full line representation of the lock bolt inv Fig. 6, the lock bolt being still in locking relation.

Such slight movement of the lock bolt in unlocking direction, through the medium of the pin I09 thereon ooacting with the slide I05, moves the slide to similar extent, thereby moving the bar 9| endwise and actuating the spring I.2I and its lateral extension I22, whereby this lateral extension by means of its frictional contact with the balance wheel 59 sets this balance wheel in motion and moves away from the balance wheel for continuation of operation of the clock mechanism.

Further movement of the slide I05 is, however, arrested by contact of its obstructing keeper II4: with the end of the bar or detent 92, preventing the unlocking of the lock bolt. This is the beginning of the safety time interval, the relations of the. pin 11, the lever BI, the bars BI, 92, the slide I05 and the detent II.5 thereon, and the positions of the keeper face 4, the pin I09, and

the lock bolt 24 being as indicated in Fig. 6 in the present exemplification. It will be noted that the slide I has been slightly moved to the left for the distance indicated between the dotted line and the full line representation of the end of the bolt 24, whereby the keeper face H4 has moved the bar 9! endwise, as indicated by the difference in positions of the connecting slots 94, 95, through which respectively the pivot screw 93 lo and the pin 96 extend, it being understood that the bar or detent 92 is pivoted on the pivot bolt and has no endwise movement. These endwise movements of the bar BI and the slide I05 are arrested by the bar or detent 92. This relation of parts initiates the time interval of such duration as may be determined by the setting of the dial wheel I3I.

At the end of this time interval the pin fl (see Fig. 7) will have engaged and moved the actuated lug 88 and moved the lever SI downwardly on its pivot 82, causing the lug II 9 thereof to move the left-hand ends of the bars 9I-92 downwardly for swinging the same on their pivot screw 93 and raising the right-hand ends of these levers. This causes first a tripping of the righthand end of the bar 9|, whereby its inclined face 99 climbs upwardly upon the end of the face H4 on the slide I95 for raising the right-hand end of the bar or detent 92 with it, and thereby protecting the locking corner I00 at the right-hand end of the bar or detent 92 against sliding contact with the corner edge of the locking face I I4 for preserving these corners and preventing wear and beveling thereof.

Upon such release movement, induced by the recoil of the spring I2I, the lateral extension I22 is again moved into contact with the balance Wheel at the termination of the safety interval for stopping the clock.

The parts are now in such relation that the movement of the lock bolt 24 may be completed by the turning of the knob 33 of the combination lock for moving the lock bolt in unlocking direction, as indicated by the difference between the dotted positions and the full line position of the lock bolt in Fig. 8.

Comparing Fig. 8 with Fig. '7, it will be noted that the following differences have taken place, namely, the slide I95 has been moved to the left by the completion of the unlocking movement, as will be noted by comparison of the 10- cations of the slots I07 and the shoulder screws I09. The upward swinging movement of the detent H5, whereby its detent face H8 has been brought to rear of the keeper face 8? on the extension 86 of the lever BI, latches the slide 505 against movement to the right, and thereby locks the lock bolt 24 in unlocked position by connection of the walls of its opening I98 with the pin I09 secured to the lock bolt.

The only way in which the lock bolt can be again released for again locking the same is by again winding the shaft 62 in clockwise direction through an angle of movement of the indi- G5 cator or winding wheel ISI, for again moving the pin TI away from the lever 8I to an angular position determined by the new time setting of the wheel I 3| and thereby again winding the spring if the spring has been sufficiently unwound. This new relation of parts is again that shown in Fig. 5, and results in raising of the latching face 8'! on the extension 85 of the lever 8| out of engagement with the detent face H8 on the detent H5, permitting the upper face of the detent H5 to ride in locking direction under the lower end of the extension 86, the detent H5 having contacted the head of the screw 03 so that the slide I05 is free to move toward the right, actuated by the lock bolt in looking direction to return the parts to the positions shown in Fig. 5.

I have in Figs. 11 to 14, inclusive, shown my improved device in connection with a key lock, similar parts being indicated by similar but primed reference numerals, the key being indicated at 33' for locking and unlocking the bolt 24.

I have in Fig. 14 shown a modification of my improved device, in which similar parts are indicated by similar but primed reference numerals. Various of the parts are slightly different in form, and the springs are somewhat differently arranged, the spring H'I' engaging a pin I36 on the slide I95, and the springs 03', 97 engaging a pin I3! on the supporting plate 4I'. Their functions, however, remain the same.

It is desired under certain circumstances and conditions that a minimum limit of time interval be provided between the beginning of opening of the lock and the full retraction of the lock bolt, and I have provided means for accomplishing this in the modification exemplified in Fig. 15, in which similar parts are indicated by similar but double primed reference numerals.

These means in the present exemplification control the release operation of the lever BI. It comprises a latch I4! for the bolt releasing mechanism. This latch remains in latching relation until the setting of the dial or winding wheel I3I for a minimum time delay, by rotation of the shaft 62" and angular movement of the pin 11" thereon in winding or setting direction for a spaced distance from the lug 88" equal to the minimum time interval desired as a matter of safety.

The latch I 4| is provided with a keeper face I42, which coacts with a latching face I43 on a lug I44 on the lever 8|". The latch MI is normally moved into latching relation with the lever 8|" by means of a spring I45, one end of which is secured to the supporting plate M" by being clamped between pins I46, I41 in the supporting plate and a screw I48 threaded into the supporting plate.

The latch I4! is slidably mounted on the supporting plate and is held to the supporting plate by shoulder screws I 49 threaded into the supporting plate and passing through slots I50 in the latch MI. The length of the slots with relation to the shank of the shoulder bolts limits the sliding movement of the latch MI.

The relation of the bolt actuating slide I05 and the detent lever H5, shown in Fig. 15, is the same as that exemplified in Fig. 8 after completion of the unlocking movement of the lock bolt 24. The latch I4I, when the keeper face I42 engages the latching face I 43, maintains the keeper face 87" in latching relation with the detent lever H5" until the lever 8|" has been released from latched relation by the latch I4I. In order to effect such release, the shaft 62 and its pin TI" must have been moved through an angular distance suflicient for the pin TI" to contact an actuating face I5I on a leg I52 of the latch slide MI and to move such latch slide,.whereby its keeper face I42 will be out of range with the latching face I43 on the lever BI", permitting retraction of said lever, limited by the pin This angular distance in the present exemplification amounts to a setting of the winding or dial wheel ISI for a time interval of at least 15 minutes, representing a minimum of safety interval between the beginning and the completion of the opening movement of the lock bolt. This safety interval may be longer, depending on the setting of the winding or setting wheel I31.

The pin ii" must move in retracting direction, throughout the angular space through which it has just been moved in such minimum time limit setting, before it can actuate the lug 88 to move the pivoted bars 9!, 92, the bar 92" serving as a detent, out of obstruction with the keeper face H4 on the slide H15, in order to permit full unlocking movement of the lock bolt 24. V

I Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is: p v g Y '1. In combination, a locking part movable in release direction and in looking direction, a clock mechanism, and control means operatively disposed between said locking part and said clock mechanism comprising a movable part having operative connection with said locking part so as to be moved in consonance therewith, a clock control part actuated upon partial movement in release direction of said locking part for initiation of operation of said clock mechanism, a detent for said movable part actuated by said clock mechanism for release of said movable part whereby to permit release by said loclL'ng part, and a detent for said movable part for latching it against movement in locking direction.

2. In combination, a locking part movable in release direction and in locking direction, a clock mechanism, and control means operatively disposed between said locking part andsaid clock mechanism comprising a movable part having operative connection with said locking part so as to be moved in consonance therewith, a clock control part actuated upon partial movement in release direction of said locking part for initiation of operation of said clock mechanism, a detent for said movable part movable for release of said movable part whereby to permit release movement by said locking part, a detent for said movable part for holding it against movement in locking direction, and an operating part in association with said clock mechanism controlling holding effects of said keepers.

3. In combination, a locking part movable in release direct-ion and in looking direction, a clock mechanism, control means operatively disposed between said locking part and said clock mechanism comprising a movable part having operative connection with said locking part so as to be moved in consonance therewith, and a pair of pivoted elements comprising a clock part control part, a detent, said clock control part slidable crosswise of its pivot and actuated by partial movement in release direction of said movable part for initiation of operation of said clock mechanism, and said detent coacting with said movable part for normally arresting unlocking movement of the same, and means between said clock mechanism and said detent whereby to actuate said detent by unwinding movement of said clock mechanism for release of said movable part.

4. In combination, a locking part and safety interval control means therefor comprising a clock mechanism, including a rotatable element for winding said clock mechanism, an actuating part rotatable in consonance therewith and retractable by the unwinding of the said clock mechanism, a detent for said locking part movable into obstructing relation by winding movement of said rotatable element and into release relation by unwinding movement of said rotatable element, and a detent for holding said locking part H in release relation, and means for release of said last-named detent by the winding movement of said rotatable element.

5. In combination, a locking part and safety interval control means therefor comprising a latching said locking part in release relation, and N means for release of said last-named detent by the winding movement of said limit part.

6. In a safety interval lock control, the combination of a locking part, a slide having operative connection therewith, a clock mechanism, a

clock control part having operative connection with said slide for clock operation by movement of said slide in unlocking direction for initiation of the safety interval, a detent for said slide, an

operating part controlled by said clock mechanism for release of said detent at the termination of said safety interval whereby tofree said locking part in unlocking direction, and a detent for holding said locking part in looking direction, said operating part having operative connection with said last-named detent for releasing the same.

7. In safety interval lock mechanism, the combination with bolt mechanism and clock mechanism of a movable part having operative connection with said bolt mechanism for being moved thereby, a clock control part actuated thereby having operative connection with said clock mechanism for initiation of the safety interval, a detent in connection with said last-named part, and a part having operative connection with said clock mechanism for release of said detent at the termination of said safety interval, said clock control part having an inclined face directed toward the engaging face of said detent for pro,- 1

tecting the latter.

8. In safety interval lock mechanism, the combination with lock mechanism and clock mechanism, of a slide having operative ,connection with the lock mechanism, a combined slide controlling detent lever and clock controlling slide, said first-named slide provided with an abutment cooperating with said combined lever and slide for moving said clock controlling slide for initiation of the safety interval and arresting said first-named slide upon partialisliding movement of said first-named slide in unlocking direction, an operating lever coacting with said combined lever and slide, and an actuating part for said last-named lever having operative connection with said clock mechanism to release said combined lever and slide for terminating said safety interval.

9. In combination, a lock control part, a clock controlled part, a combined lever and slide therebetween, said combined lever and slide positioned for movement of said slide by said lock control part for initiating clock actuation and for latching of said lock control part, and said clock controlled part by such clock actuation acting on said combined lever and slide for releasing said lock control part for retraction of said lock control part, and a latch between said clock controlled part and said lock control part to latch said lock control part in retracted position, said last-named latch releasable by retraction of said clock controlled part.

10. In combination, a lock control part provided with a keeper, a clock controlled part, and

a combined lever and slide therebetween, said combined lever and slide positioned for movement of said slide for initiating clock actuation and for latching of said lock control part in release direction by said keeper, and said clock controlled part by such clock actuation acting on said combined lever and slide for releasing said keeper for retraction of said lock control part.

11. In combination, a lock control part, a detent thereon, a clock controlled part provided with a keeper for said detent, and a combined lever and slide between said lock control part and said clock controlled part, said combined lever and slide positioned for movement of said slide by said lock control part for initiating clock actuation and. for latching of said lock control part in unlocking direction, said clock controlled part by such clock actuation acting on said combined lever and slide for releasing said lock control part for full retraction of said lock control part, said detent and said keeper latching said lock control part in unlocking position, and said keeper releasable from said detent by retraction of said clock controlled part.

12. In a safety interval lock mechanism, the combination of a locking part, and control mechanism for controlling unlocking movement of said locking part after initiation of such unlocking movement including a minimum time limit device for insuring minimum limit of lapse of time for unlocking control of said control mechanism.

13. In a safety interval lock mechanism, the combination of a locking part, and control mechanism for controlling unlocking movement of said locking part after initiation of such unlocking movement including a minimum time limit device for insuring minimum limit of lapse of time between such initiation of such unlocking movement and release of such locking part for full unlocking movement of such locking part.

14. In combination, a locking part movable in release direction, a clock mechanism, and control means operatively disposed between said locking part and said clock mechanism comprising a movable part having operative connection with said locking part so as to be moved by said locking part, a clock control part actuated by partial movement in release direction of said locking part for initiation of operation of said clock mechanism, a detent for said movable part actuated by said clock mechanism for full release movement of said movable part, and a latch to hold said detent in unlatching relation.

15. In combination, a locking part, a clock mechanism, and control means for said locking part comprising a part actuated by partial movement of said locking part for initiation of operation of said clock mechanism at the beginning of the safety interval, a latch to latch said locking part upon such partial movement; said latch actuated by said clock mechanism at the termination of the safety interval for release of said latch to permit full unlocking movement of said locking.

part, and a minimum time limit device for said latch.

16, In combination, a locking part and safety interval control means therefor comprising a clock mechanism including a winding element for said clock mechanism, an actuating part movable with the latter and retractable by the unwinding of said clock mechanism, a detent for said locking part movable into obstructing relation upon winding movement of said winding element and into release relation upon unwinding movement of said winding element, and a latch for said detent holding said detent in unobstructing relation throughout a minimum limit of duration of unwinding movement of said winding element.

17. In a safety interval lock mechanism, the combination of a time movement, a bolt, a detent to obstruct unlocking movement of said bolt, connecting means between said bolt and said time movement to initiate a safety time interval for interval, and a detent to obstruct bolting moven ment of said bolt.

18. In a safety interval lock mechanism, the combination of a time movement, a bolt, a detent to obstruct unbolting movement of said bolt, connecting means between said bolt and said time movement toinitiate a safety time interval for release of said detent, connecting means between said time movement and said detent to release said detent upon expiration of said safety time interval, a detent to obstruct bolting movement of said bolt, and a latch to maintain said last-named detent in obstructing relation, said latch releasable by resetting of said time movement.

19. In a safety interval lock mechanism, the combination of a time movement, a bolt, a detent to obstruct unbolting movement of said bolt, connecting means between said bolt and said time movement to initiate a safety time interval for release of said detent, connecting means between said time movement and said detent to release said detent upon expiration of said safety time interval, and a minimum time limit device obstructing resetting of said detent in such obstructing relation to compel minimum duration of said safety time interval.

PAUL S. MILLICE. 

